Obituaries

Survivors include a daughter, Elizabeth L. Mears of McLean; 14 grandchildren; 20 great-grandchildren; and 13 great-great-grandchildren.

Walter W. RistowMap Division Chief

Walter W. Ristow, 97, the former chief of the Library of Congress's geography and map division, died of heart disease April 3 at Collington Episcopal Life Care Community in Mitchellville.

Dr. Ristow worked at the library from 1946 until his retirement in 1978 and during the last 11 years of his career was the map division chief. His specialty was U.S. road maps, and he wrote many papers and several books on cartography.

Before joining the Library of Congress, he was chief of the map division at the New York Public Library from 1937 to 1946 and was a map analyst during World War II for the Army Intelligence Service.

Dr. Ristow was born in La Crosse, Wis., and attended a German language school there as a boy. He graduated from the University of Wisconsin and received a master's degree from Oberlin (Ohio) College in 1933 and a doctorate from Clark University in Worcester, Mass., in 1937. All three degrees were in geography.

He was a co-founder and the first president of the Washington Map Society, which awards an annual prize in his name to people specializing in the history of cartography or map librarianship.

He lived in McLean, volunteered for the Boy Scouts and served on the board of trustees of the Fairfax County Public Library.

His wife of 44 years, Helen Doerr Ristow, died in 1987.

Survivors include three sons, Richard Ristow of Providence, R.I., Bill Ristow of Seattle and Steve Ristow of Falls Church; three brothers; and three grandchildren.

Mary Howell DuganDefense Department Examiner

Mary Irene Howell Dugan, 88, who held several positions with the old Defense Fuel Supply Center, died March 16 at her home in Fredericksburg after a heart attack. She had lived in Alexandria until about six months ago.

Mrs. Dugan was born in Riverdale, grew up in Herndon and was educated at Catholic schools in Prince George's County. She was an excellent dancer in her youth and studied dancing in New York.